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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions, except per share data) | 2023 |  | 2022 |  | 2023 |  | 2022
Net income attributable to common shareholders | $ | 51.9 |  |  | $ | 44.6 |  |  | $ | 138.8 |  |  | $ | 142.9 |
Average basic shares outstanding | 56.8 |  |  | 56.7 |  |  | 56.8 |  | 56.7 |
Effect of dilutive share-based awards | 0.7 |  |  | — |  |  | 0.6 |  |  | — |
Average diluted shares outstanding | 57.5 |  |  | 56.7 |  |  | 57.4 |  |  | 56.7 |
Earnings per basic share | $ | 0.91 |  |  | $ | 0.79 |  |  | $ | 2.44 |  |  | $ | 2.52 |
Earnings per diluted share | $ | 0.90 |  |  | $ | 0.79 |  |  | $ | 2.42 |  |  | $ | 2.52 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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